Failure law of hydraulic pipe joints sealing performance under vibration loads

• Published in: Engineering failure analysis Vol. 166; p. 108906
• Main Authors: Deng, Lichuan, Luo, Bin, Zhang, Kaifu, Cheng, Hui, Long, Kuiyu, Liang, Biao
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.12.2024
• Subjects: Fretting wear; Sealing performance; Vibration; Sealing performance; Fretting wear; Vibration
• DOI: 10.1016/j.engfailanal.2024.108906
• ISSN: 1350-6307

•Experimental tests address the impacts of vibration on hydraulic pipe joint sealing performance.•The vertical amplitude of the pipe joint is only 46.5% of the parallel amplitude.•The evolution of the microscopic morphology of the sealing interface under vibration load is revealed.•Carbon is significantly reduced in the vibration wear area.•The high tightening torque effectively suppresses frictional wear caused by vibration loads and reduces the wear width. Aviation hydraulic pipe joints are inevitably affected by vibration loads during service. Fatigue relaxation occurs in the pipe joint structure by vibration, and fretting fatigue wear occurs in its sealing interface, leading to a decline in sealing performance. In order to investigate the sealing performance of hydraulic pipe joints affected by vibration load, this paper first analyzes the modal distribution of the sealing system pipeline under different hydraulic pressures and hydraulic fluid flow rates through vibration frequency sweeping experiments. Secondly, the vibration load is applied to the pipe joints for different numbers of cycles, which reveals the microscopic wear behavior of the sealing interfaces under different tightening torques. Finally, by carrying out the leakage measurement experiment under vibration load, the evolution law of the sealing performance of pipe joints under different hydraulic fluid pressures and tightening torques was obtained.